MAP and MSM APs do support bridging - it's called Wireless Mesh. You configure one of the devices to be the Master AP of the Mesh, the others are slaves. I'd choose the one in the Internet side to act as Master.
Bridging only works between similar devices, so you need either a MAP or WAP on each end of the link. Trying to mix and match is likely to fail.
Instructions on creating a wireless mesh between the APs is described in the configuration guides, which are freely available from the device support pages. However you need to pick the manual that corresponds to your FW version.